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onsemi 74LVTH543MTCX
- Part No.:
- 74LVTH543MTCX
- Manufacturer:
- onsemi
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH543MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
74LVTH543MTCX from Fairchild Semiconductor is a low-voltage octal registered transceiver with 3-STATE outputs, designed for bidirectional data flow between 3.3V and 5V systems. It features dual D-type latch sets (A→B and B→A), independent Latch Enable (LEAB/LEBA) and Output Enable (OEAB/OEBA), bushold inputs eliminating external pull-ups, and ±32 mA/64 mA drive capability. Used in bus interface logic for mixed-voltage backplanes and memory expansion modules.
For engineers reviewing the 74LVTH543MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include its 24-pin TSSOP package, dual-direction latching control, 3.3V VCC operation with 5V-tolerant I/O, bushold input retention, and guaranteed AC timing down to −40°C.
Technical Context
The 74LVTH543MTCX implements two independent 8-bit D-latch paths-A-to-B and B-to-A-with separate Chip Enable (CEAB/CEBA), Latch Enable (LEAB/LEBA), and Output Enable (OEAB/OEBA) controls. Each path operates transparently when LE is LOW and latches on LE rising edge, while OE determines output driver state.
Its BiCMOS process enables TTL-compatible speed at 3.3V supply, with propagation delays as low as 1.3 ns (tPLH/tPHL) and output skew ≤1.0 ns. Bushold circuitry maintains valid logic levels on un-driven A0–A7 and B0–B7 pins without external resistors, supporting live insertion/extraction and glitch-free power-up/down behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 2.7V to 3.6V - ensures compatibility with 3.3V logic domains while enabling 5V-tolerant I/O |
| IOH/IOL Drive | −32 mA / +64 mA - supports driving heavy capacitive loads and multiple TTL inputs |
| tPLH/tPHL | 1.3 ns min / 4.8 ns max (VCC = 2.7V) - defines minimum clock-to-output timing for high-speed bus handshaking |
| Bushold Current | ±75 µA at VI = 0.8V/2.0V - actively holds floating inputs at valid logic levels without pull-up resistors |
| Operating Temp | −40°C to +85°C - qualified for industrial temperature range operation in embedded control systems |
| 3-STATE Leakage | ±5 µA (IOZL/IOZH) - minimizes bus leakage current when outputs are disabled |
| Input Clamp Voltage | −1.2 V (VIK) - protects inputs against negative transients during hot-swap events |
Pinout & Package
74LVTH543MTCX is packaged in a 24-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch. Pin 1 marked by notch or dot; standard pin 1 orientation applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground Reference | Common return path for all internal logic and I/O drivers; must be low-impedance connection |
| VCC | Power Supply | 3.3V nominal supply; decoupling capacitor required within 1 cm of pin |
| A0–A7 | Side A I/O | Bidirectional data port; functions as input when CEAB=LOW and OEAB=LOW, output when latched and enabled |
| B0–B7 | Side B I/O | Bidirectional data port; mirrors A-side functionality with CEBA/LEBA/OEBA controls |
| LEAB, LEBA | Latch Enable | Rising-edge triggered latch control; transparent when LOW, stores data on rising edge |
| OEAB, OEBA | Output Enable | Active-LOW enable for respective B- or A-side output drivers; HIGH places outputs in high-impedance |
| CEAB, CEBA | Chip Enable | Active-LOW gate for data path activation; disables latching and output buffering when HIGH |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Supports direct interfacing to 5V TTL buses while operating from 3.3V supply, eliminating level-shifter components |
| Bushold Inputs | Retains logic state on unused A/B port pins without external pull-up resistors, reducing BOM count and board space |
| Live Insertion Support | Power-up/down high-impedance state prevents bus contention during hot-plug operations in modular backplane systems |
| High-Drive Outputs | Delivers +64 mA sink current per output, enabling direct drive of multiple 74-series TTL loads or termination networks |
| Low Propagation Skew | ≤1.0 ns output-to-output skew ensures simultaneous data validity across all 8 bits for synchronous bus transfers |
Applications
| Industrial Backplane Interface | Memory Expansion Module |
|---|---|
Use Scenario: Interfacing a 3.3V FPGA-based controller to legacy 5V peripheral cards in a modular PLC rack. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing address/data bus handoff with independent latch and output control per direction. Use Value: Eliminates need for discrete level shifters and pull-up networks while maintaining setup/hold timing integrity across voltage domains. | Use Scenario: Adding SRAM or Flash memory to a 3.3V microcontroller system requiring 5V-compatible data/address lines. IC Role / Device Role / Timing Role: Octal registered buffer providing controlled write-enable timing and bus isolation during memory read/write cycles. Use Value: Bushold inputs prevent floating address lines during chip select transitions, improving noise immunity and reducing EMI. |
| Hot-Swappable I/O Card | Legacy System Upgrade Bridge |
Use Scenario: Enabling safe insertion/removal of field I/O modules in an industrial automation chassis without powering down the main controller. IC Role / Device Role / Timing Role: Bus isolation device with glitch-free power-up/down 3-STATE behavior and robust ESD protection. Use Value: Prevents bus contention and signal corruption during card insertion via inherent high-Z state during power ramp. | Use Scenario: Retrofitting a 5V ISA-bus PC architecture with modern 3.3V peripherals using minimal adapter redesign. IC Role / Device Role / Timing Role: Voltage-domain translator and register stage synchronizing legacy strobes with low-voltage logic timing windows. Use Value: Matches 74LS543 functional behavior while adding bushold and improved drive strength for reliable legacy interoperability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT543PWR | TI part uses identical 24-pin TSSOP package and matches AC/DC specs closely; bushold not explicitly specified in latest datasheet | Same functional role in 3.3V↔5V bus bridging; requires verification of bushold behavior in target layout | Select if TI supply chain preference exists and bushold is not critical; confirm IOH/IOL and tPLH match in final design |
| 74ALVCH16543DGGR | Texas Instruments 16-bit variant in 48-pin TSSOP; double data width, no bushold, higher ICCZ (0.5 mA vs 0.19 mA) | Suitable for wider bus interfaces where pin count allows; not drop-in due to doubled width and different pinout | Choose only when 16-bit width is needed; not a replacement for 74LVTH543MTCX in existing 24-pin layouts |
Compared with SN74LVT543PWR and 74ALVCH16543DGGR, the 74LVTH543MTCX offers verified bushold functionality in a compact 24-pin footprint and lowest quiescent supply current (0.19 mA), making it optimal for space-constrained, low-power industrial bus interfaces requiring input retention.
Availability
74LVTH543MTCX is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, hot-swappable I/O cards, and legacy system upgrade bridges requiring stable component supply and long-term lifecycle support.
Supply support for 74LVTH543MTCX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The LVTH family was engineered for low-voltage, high-speed bus interface applications requiring 3.3V operation with 5V tolerance, targeting backplane, memory, and upgrade bridge designs where reliability and mixed-voltage interoperability are critical.
FAQ
What is the maximum recommended supply voltage for the 74LVTH543MTCX?
The absolute maximum VCC rating for the 74LVTH543MTCX is +4.6 V, but the recommended operating range is strictly 2.7 V to 3.6 V. Operation above 3.6 V risks exceeding DC electrical limits and may compromise latch stability or bushold performance. Always maintain VCC within this window for guaranteed timing and functional compliance per the November 2000 revision of DS012448.
Does the 74LVTH543MTCX support true bidirectional data flow without external direction control logic?
Yes - the 74LVTH543MTCX supports independent bidirectional flow via dedicated CEAB/LEAB/OEAB (A→B) and CEBA/LEBA/OEBA (B→A) controls. No external direction line is needed; each path is fully autonomous. This enables simultaneous A→B latching while B→A outputs remain disabled, a capability confirmed in the Data I/O Control Table and Functional Description sections of the official datasheet.
How does bushold functionality work on the 74LVTH543MTCX, and what design impact does it have?
Bushold on the 74LVTH543MTCX actively drives unused A0–A7 and B0–B7 inputs to their last-valid logic state using internal feedback circuitry. Per datasheet Section "Features", this eliminates external pull-up resistors, reducing component count, PCB area, and potential noise coupling. It requires no configuration and operates across the full −40°C to +85°C range with ±75 µA holding current at 3.0 V.
Can the 74LVTH543MTCX be used in hot-swap applications, and what features enable that?
Yes - the 74LVTH543MTCX supports live insertion/extraction per its "Features" list. Key enablers include power-up/power-down high-impedance outputs (preventing bus contention during power ramp), bushold input retention (avoiding floating states), and robust ESD ratings (>2000V HBM). These are validated under actual hot-swap stress conditions and documented in the November 2000 revision of DS012448.
What is the output drive strength of the 74LVTH543MTCX, and how does it compare to standard TTL?
The 74LVTH543MTCX delivers +64 mA sink current and −32 mA source current per output - exceeding standard TTL (±16 mA) and matching advanced BiCMOS ABT performance. This is measured per IOL/IOH specifications in the DC Electrical Characteristics table (page 4), enabling direct drive of multiple 74-series loads or termination networks without buffers, a key advantage over earlier 74LS or 74ALS transceivers.
74LVTH543MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LVTH543MTCX FAQ
1.How can I place an order for 74LVTH543MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH543MTCX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74LVTH543MTCX reliable?
The price and inventory of 74LVTH543MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH543MTCX is usually 5 days.
3.What payment methods are accepted for 74LVTH543MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH543MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH543MTCX?
74LVTH543MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH543MTCX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74LVTH543MTCX?
For technical support, including 74LVTH543MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH543MTCX requirements.
6.How does Aetrix verify that 74LVTH543MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVTH543MTCX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LVTH543MTCX meets industry standards.
7.What is the process for return or replacement of 74LVTH543MTCX?
All 74LVTH543MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH543MTCX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74LVTH543MTCX part is unused and in its original packaging.
Return procedure for 74LVTH543MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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